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Ricardo de Oliveira Perdiz

Bio

Olá, bem vindo ao meu sítio web. Sou um recém doutor em Ciências Biológicas (Botânica) pelo Instituto Nacional de Pesquisas da Amazônia (INPA) e meu trabalho principal e paixão é documentar a flora Amazônica e buscar entender como se deu o processo de diversificação desta flora. Minha pesquisa se concentra na sistemática e taxonomia de plantas com flores, em especial envolvendo a família Burseraceae, grupo de plantas que engloba os breus, amesclas, palo santo, e a mirra. Também me envolvo em inventários florísticos, inventários de parcelas permanentes, e tenho colaborações com cientistas que trabalham com um enfoque mais ecológico (veja meu CV para ver uma lista de publicações).

Tenho muito interesse no uso de linguagens de programação no processo científico associado ao uso de bancos de dados, e este sítio web é um resultado de anos brincando, aprendendo, e querendo divulgar meu trabalho.

Interesses

  • Sistemática vegetal
  • Biologia evolutiva
  • Delimitação de espécies
  • Inventários florísticos
  • Reprodutibilidade na ciência

Formação

  • Doutorado em Ciências Biológicas (Botânica), 2019

    Instituto Nacional de Pesquisas da Amazônia (INPA), Amazonas, Brasil

  • Mestrado em Botânica, 2011

    Universidade Estadual de Feira de Santana (UEFS), Bahia, Brasil

  • Bacharelado em Ciências Biológicas, 2009

    Universidade Estadual de Santa Cruz (UESC), Bahia, Brasil

Postagens recentes

Junção de tabelas com um identificador comum

Ensina como unir diferents tabelas de dados utilizando colunas em comum entre duas tabelas como identificadores, utilizando a função …

O que é o Tidyverse?

Comenta o conjunto de pacotes de R conhecido como Tidyverse, e como eles mudaram a forma de analisar dados usando o ambiente R.

Importando e exportando dados no R

Ensina ferramentas básicas para importar arquivos de texto simples ao R utilizando os pacotes base, readr e data.table.

Baixando dados de repositórios virtuais de dados

Ensina ferramentas básicas para baixar dados de repositórios virtuais, manualmente ou com o auxílio do pacote rgbif.

Compondo mapas em R

Descreve todos os passos para plotar o mapa publicado em Rodrigues et al. 2017 com o uso da função layout para compor um mapa em R.

Publicações recentes

Dataset on Wood Density of Trees in Ecotone Forests of the Northern Brazilian Amazonia

Wood density is expressed by the ratio between dry weight and fresh volume of a sample piece. The value of this measure is an important variable for assessing wood functional properties, successional stages and biomass/carbon stock estimates in different terrestrial ecosystems. Wood density data were collected for tree species from ecotone forests of the northern Brazilian Amazonia. We sampled 680 individuals with stem diameter ≥10 cm. For each sampled individual measurements were taken for three stem variables: bark thickness (mm), bark density (g cm−3) and wood density (g cm−3). This dataset is intended to improve biomass and carbon estimates of forests in the northern ecotone region of Brazilian Amazonia, an area poorly known in terms of ecosystem dynamics.

A new species of Protium (Burseraceae) from the Pacific Coast of Costa Rica

Protium santamariae is described and illustrated. The new species is restricted to the Pacific Coast of Costa Rica but shares morphological similarities with two South American species, P. kleinii and P. krukoffii. We provide a description, a distribution map, notes on its taxonomy, and a key to distinguish it from morphologically similar species.

Floristic composition in ecotone forests in northern Brazilian Amazonia: preliminary data

Ecotone has been defined as “a multi-dimensional environmentally stochastic interaction zone between ecological systems with characteristics defined in space and time, and by the strength of the interaction” (Hufkens et al. 2009). This is a known concept to define transitional zones between two or more ecological communities, ecosystems or biotic regions. Ecotone forests, dispersed in northern Brazilian Amazonia, are natural formations which have been largely affected by anthropogenic impacts, such as deforestation and fire. Maracá Ecological Station, State of Roraima, Brazil, is a protected area with extensive representations of ecotone forests in this region of the Amazonia. Forest inventories and floristic surveys are important as they extend our knowledge (1) of forest structure and tree species composition and (2) of tree and palm species ecology in this region of the Amazonia. Both improve our ability to predict changes in plant diversity, considering the future scenarios of climate change in comparison with previous surveys performed in Maracá. We present a forest inventory carried out in 129 plots (10 m x 50 m; 6.45 ha in total) dispersed in a grid (5 km x 5 km) located in a forest zone ecotone in the eastern part of Maracá Ecological Station. All stems (tree + palm) with diameter at breast height ≥ 10 cm were recorded, identified and measured. A total of 3040 stems were recorded (tree = 2815; palm = 225), corresponding to 42 botanic families and 140 identified species. Seven families and 20 genera contained unidentified taxa (12.2%). Sapotaceae (735 stems; 10 species), Leguminosae (409; 24) and Rubiaceae (289; 12) were the most abundant families. Peltogyne gracilipes Ducke (Leguminosae), Pradosia surinamensis (Eyma) T.D.Penn. (Sapotaceae) and Ecclinusa guianensis Eyma (Sapotaceae) were the species with the highest importance value index (~ 25%). The dominance (m2 ha-1) of these species corresponds to > 36% of the total value observed in the forest inventory. Our dataset provides complementary floristic and structure information on tree and palm in Maracá, improving our knowledge of this Amazonian ecotone forest.

New record and emended description of a rare white-sand Amazonian species: Schoepfia clarkii (Schoepfiaceae)

Schoepfia clarkii is a rare species of Schoepfiaceae that to date has been known only from the single flowering specimen used in the original description from white-sand vegeta- tion in Venezuela. Here we report new records for this species collected from the lower Negro River basin in Brazil, ca. 900 km from the type locality, but also from white-sand vegetation. We provide a more detailed description of the species, including the first observations of fruit characters, as well as illustrations, photographs, a distribution map, and discussion of its conservation status. We also provide a key for the identification of the South American species of Schoepfia.

Tree species composition of natural forest islands in a savanna matrix in the northern Brazilian Amazonia. v1.9

A forest inventory was carried out in 12 forest islands scattered in the large savanna matrix of Roraima, northern Brazilian Amazon. The fieldwork occurred between 2013-2014 based on direct observations along transects established between the edge-interior gradient of each sampled forest island. It was investigated species composition and forest structure variables: stem diameter (DBH = diameter at breast height ≥ 10 cm) and total height (visually estimated). All floristic dataset was correlated with the forest fragment size. The survey was conducted by the Research Group Ecology and Natural Resource Management of Roraima Savanna, associated to the National Institute for Research in Amazonia (INPA).

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